Page 19 - Mathematics Coursebook

End of unit review

End of unit review

1 Here are the midday temperatures one Monday, in degrees Celsius, in four cities.

Astana Wellington Kuala Lumpur Kiev

−10 6 18 −4

a Which city is the coldest?
b What is the temperature difference between Kuala Lumpur and Kiev?
c What is the temperature difference between Kiev and Astana?

2 At 9 p.m. the temperature in Kurt’s garden was −2 °C.
During the night the temperature went down 5 degrees and then it went up 10 degrees by midday
the next day.
What was the temperature at midday in Kurt’s garden?

3 Work these out.
a 6 − 11 b −5 − 4 c −8 + 6 d −3 + 18

4 Work these out.
a −7 + −8 b 6 − −9 c −10 − −8 d 5 + −12
5 Write down the first three multiples of each number.
a 8 b 11 c 20
6 Find the lowest common multiple of each pair of numbers.
a 6 and 9 b 6 and 10 c 6 and 11 d 6 and 12

7 List the factors of each number.
a 25 b 26 c 27 d 28 e 29

8 Find the common factors of each pair of numbers.
a 18 and 27 b 24 and 30 c 26 and 32
9 Look at the numbers in the box. From these numbers,
write down: 26 153 26 154 26 155 26 156 26 157
a a multiple of 5
b a multiple of 6
c a multiple of 3 that is not a multiple of 9.

10 There is just one prime number between 110 and 120.
What is it?

11 Find the factors of 60 that are prime numbers.
12 a What is the smallest number that is a product of three different prime numbers?
b The number 1001 is the product of three prime numbers. One of them is 13.
What are the other two?

18 1 Integers